PDF malware analysis — malicious · 4e68c6617c64451d

MALICIOUS

PDF

9.9 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 26e9d36404253354922a063ba54b6a3b SHA-1: 36ae7ac9ca7ad0654a09b4747d714aff9c08c660 SHA-256: 4e68c6617c64451de47164c186e7275cce729fe89100a59bb291313ef7cc682c

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a dropper. Static analysis revealed embedded JavaScript, which is often used to exploit vulnerabilities in PDF viewers. The presence of `unescape()` and `String.fromCharCode()` calls within the JavaScript stream indicates obfuscation techniques commonly employed to hide malicious code. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the dropper classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7212420-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212420-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `17d2cbf332f6ac80b5c392fa6eaae1fb761319c2dbaa459ad9bbe5a9a1701154`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11475 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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